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4.4
Charging positions (single point)
The best position for charging the air conditioners is the section between the thermostatic valve and the
evaporator; care should be taken to avoid fixing the thermostat bulb until the operation is complete: this is
important to ensure that the valve orifice remains open so as to allow the passage of refrigerant also
toward the condenser/receiver.
If possible, avoid the inflow of refrigerant into the compressor as this may cause excessive dilution of the
lubricant; in any case, first check the compatibility between the crankcase capacity and the required charge
volumes.
5
Electrical Connections
5.1
Generalities
Before carrying out any job on electrical parts, make sure the power supply is
disconnected.
Check that the mains electricity supply is compatible with the specifications (voltage, number of phases,
frequency) shown on the unit rating plate. The power connection for single-phase loads is to be made with
a three-pole cable and "N" wire at the centre of the star (optional: power supply w/o neutral).
The size of the cable and line protections must conform to the specifications provided in
the wiring diagram.
The supply voltage may not undergo fluctuations exceeding ±5% and the unbalance between phases must
always be below
The above operating conditions must always be complied with: failure to ensure said
conditions will result in the immediate invalidation of the warranty.
The electrical connections must be made in accordance with the information shown in the wiring diagram
provided with the unit and with current and local regulations. An earth connection is mandatory. The
installer must connect the earth wire using the earth terminal situated on the electric control board (yellow
and green wire). The power supply to the control circuit is taken from the power line through an insulating
transformer situated on the electric control board. The control circuit is protected by suitable fuses or
automatic breakers depending on the unit size.
@DNOVA THN_R410A-IOM-1506-E
2%.
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